Mixing text + computations

Markdown, quarto, webpages, pandoc

Denis Schluppeck

1/18/23

Motivation

  • often useful to produce short documents that mix code snippets, plots, text, images

  • could use PPT, Keynote, Word (but don’t play nicely with version control)

  • use a simple text based version

Where would you use this?

  • teaching (content changes slightly/a lot) each year
  • research: publishing data + code is now a must for many journals
  • after this walk-through, it would be great to discuss if people find this useful?! What for?

markdown is widely used

  • if you want some light markup
  • go beyond simple text
  • a couple of key things like
  • easy to write links

… images

some bread in a dutch oven

Maths, equations are easy

\[\chi^2 = \sum_i \Big( \frac{y_i-y(x_i; a_1\dots, a_M )}{\sigma_i} \Big)^2 \]

an online editor at stackedit, to just have a play

Challenges

  • placing images where you want them (arbitrarily on page) requires some work

  • you need to render / transform it (only seconds, but not instantaneous)

  • if you make mistakes you (it’s a very light version of coding)

  • if you link to local files (images, etc), you have to remember to move them along (not a problem if everything is online)

Advantages

  • markdown (itself) structures your documents

  • can easily be tranformed into pdf, pptx, docx, revealjs, etc.

  • gets rendered nicely on github.com, by defauilt

  • easy to edit, rules are simple to learn

  • you can add in computations code in r, python, julia et al and make them part of your documents \(\rightarrow\) quarto

quick demo

  • VSCode with markdown plugin (linting, preview)
  • (! the github.com repo which gets rendered using a tool called jekyll under the hood)

quarto

  • a command line tool that renders a flavour of markdown called qmd (quarto-markdow)

  • a superset of markdown, so any previous work should be ok

  • by adding some additional info at top of document, you can opt into lots of good stuff

info at top: YAML

A text block delimited by ---, key/value

---
title: "Mixing text + computations"
subtitle: "Markdown, quarto, webpages, pandoc"
author: Denis Schluppeck
date: 2023-01-18
format:
  revealjs: 
    mainfont: Helvetica
    sansfont: Helvetica
---

quarto

  • if you like RStudio, there is a nice interface

  • VScode has a plugin that works well

  • or if you prefer emacs/vim/nano/TextEdit, the command line tool is not that hard to use.

quarto preview test.qmd 
# or render
quarto render test.qmd --to pdf

Any Questions?